Tenantization of Search Result Ranking

1. A computer storage device storing computer-executable instructions for implementing a method of indexing a first document in a multi-tenant hosting environment, the method comprising: indexing a first property of a first document in a search index, comprising: identifying a first plurality of keys in the first property of the first document; prepending a first tenant identifier to each key of the first plurality of keys to form a first plurality of first tenant identifier-key combinations; storing the first plurality of first tenant identifier-key combinations in a search index; and mapping the first property of the first document to each of the first plurality of first tenant identifier-key combinations in the search index; indexing a second property of the first document in the search index, comprising: identifying a second plurality of keys in the second property of the first document, wherein the second plurality of keys has one or more keys in common with the first plurality of keys; prepending the first tenant identifier to each key of the second plurality of keys to form a second plurality of first tenant identifier-key combinations, wherein the second plurality of first tenant identifier-key combinations has one or more first tenant identifier-key combinations in common with the first plurality of first tenant identifier-key combinations; and mapping the second property of the first document to each of the second plurality of first tenant identifier-key combinations in the search index.

2. The computer storage device of claim 1 , further comprising: identifying a length of the first property of the first document; and storing the length of the first property.

3. The computer storage device of claim 2 , further comprising: retrieving the length of the first property in each document of a plurality of documents associated with a first tenant of the multi-tenant hosting environment; calculating an average document length for the first property associated with the first tenant; and storing the average document length for the first property associated with the first tenant.

4. The computer storage device of claim 1 , further comprising: determining a document frequency for each first tenant identifier-key combination; and storing the document frequency for each first tenant identifier-key combination.

5. The computer storage device of claim 1 , further comprising: detecting a link in the first document that references a second document; detecting a source tenant identifier associated with the first document; and detecting a target tenant identifier associated with the second document.

6. The computer storage device of claim 5 , further comprising: storing the link in a web graph when the target tenant identifier matches the source tenant identifier.

7. The computer storage device of claim 5 , further comprising: not storing the link in a web graph when the target tenant identifier does not match the source tenant identifier.

8. A computer system, comprising: at least one processor; and at least one memory, communicatively coupled to the at least one processor and containing computer-readable instructions that, when executed by the at least one processor, perform a method of indexing a first document in a multi-tenant hosting environment, the method comprising: indexing a first property of a first document in a search index, comprising: identifying a first plurality of keys in the first property of the first document; prepending a first tenant identifier to each key of the first plurality of keys to form a first plurality of first tenant identifier-key combinations; storing the first plurality of first tenant identifier-key combinations in a search index; and mapping the first property of the first document to each of the first plurality of first tenant identifier-key combinations in the search index; indexing a second property of the first document in the search index, comprising: identifying a second plurality of keys in the second property of the first document, wherein the second plurality of keys has one or more keys in common with the first plurality of keys; prepending the first tenant identifier to each key of the second plurality of keys to form a second plurality of first tenant identifier-key combinations, wherein the second plurality of first tenant identifier-key combinations has one or more first tenant identifier-key combinations in common with the first plurality of first tenant identifier-key combinations; and mapping the second property of the first document to each of the second plurality of first tenant identifier-key combinations in the search index.

9. The computer system of claim 8 , further comprising: identifying a length of the first property of the first document; and storing the length of the first property.

10. The computer system of claim 9 , further comprising: retrieving the length of the first property in each document of a plurality of documents associated with a first tenant of the multi-tenant hosting environment; calculating an average document length for the first property associated with the first tenant; and storing the average document length for the first property associated with the first tenant.

11. The computer system of claim 8 , further comprising: determining a document frequency for each first tenant identifier-key combination; and storing the document frequency for each first tenant identifier-key combination.

12. The computer system of claim 8 , further comprising: detecting a link in the first document that references a second document; detecting a source tenant identifier associated with the first document; and detecting a target tenant identifier associated with the second document.

13. The computer system of claim 12 , further comprising: storing the link in a web graph when the target tenant identifier matches the source tenant identifier.

14. The computer system of claim 12 , further comprising: not storing the link in a web graph when the target tenant identifier does not match the source tenant identifier.

15. A computer-implemented method of indexing a first document in a multi-tenant hosting environment, comprising: indexing a first property of a first document in a search index, comprising: identifying a first plurality of keys in the first property of the first document; prepending a first tenant identifier to each key of the first plurality of keys to form a first plurality of first tenant identifier-key combinations; storing the first plurality of first tenant identifier-key combinations in a search index; and mapping the first property of the first document to each of the first plurality of first tenant identifier-key combinations in the search index; indexing a second property of the first document in the search index, comprising: identifying a second plurality of keys in the second property of the first document, wherein the second plurality of keys has one or more keys in common with the first plurality of keys; prepending the first tenant identifier to each key of the second plurality of keys to form a second plurality of first tenant identifier-key combinations, wherein the second plurality of first tenant identifier-key combinations has one or more first tenant identifier-key combinations in common with the first plurality of first tenant identifier-key combinations; and mapping the second property of the first document to each of the second plurality of first tenant identifier-key combinations in the search index.

16. The computer-implemented method of claim 15 , further comprising: retrieving a length of a first property in each document of a plurality of documents associated with a first tenant of the multi-tenant hosting environment; calculating an average document length for the first property associated with the first tenant; and storing the average document length for the first property associated with the first tenant.

17. The computer-implemented method of claim 15 , further comprising: determining a document frequency for each first tenant identifier-key combination; and storing the document frequency for each first tenant identifier-key combination.

18. The computer-implemented method of claim 15 , further comprising: detecting a link in the first document that references a second document; detecting a source tenant identifier associated with the first document; and detecting a target tenant identifier associated with the second document.

19. The computer-implemented method of claim 18 , further comprising: storing the link in a web graph when the target tenant identifier matches the source tenant identifier.

20. The computer-implemented method of claim 18 , further comprising: not storing the link in a web graph when the target tenant identifier does not match the source tenant identifier.